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linux/drivers/char/nozomi.c
Stefani Seibold 4457d98459 kfifo: fix kfifo miss use of nozami.c 
There are different types of a fifo which can not handled in C without a
lot of overhead.  So i decided to write the API as a set of macros, which
is the only way to do a kind of template meta programming without C++.
This macros handles the different types of fifos in a transparent way.

There are a lot of benefits:

- Compile time handling of the different fifo types
- Better performance (a save put or get of an integer does only generate
  9 assembly instructions on a x86)
- Type save
- Cleaner interface, the additional kfifo_..._rec() functions are gone
- Easier to use
- Less error prone
- Different types of fifos: it is now possible to define a int fifo or
  any other type. See below for an example.
- Smaller footprint for none byte type fifos
- No need of creating a second hidden variable, like in the old DEFINE_KFIFO

The API was not changed.

There are now real in place fifos where the data space is a part of the
structure.  The fifo needs now 20 byte plus the fifo space.  Dynamic
assigned or allocated create a little bit more code.

Most of the macros code will be optimized away and simple generate a
function call.  Only the really small one generates inline code.

Additionally you can now create fifos for any data type, not only the
"unsigned char" byte streamed fifos.

There is also a new kfifo_put and kfifo_get function, to handle a single
element in a fifo.  This macros generates inline code, which is lit bit
larger but faster.

I know that this kind of macros are very sophisticated and not easy to
maintain.  But i have all tested and it works as expected.  I analyzed the
output of the compiler and for the x86 the code is as good as hand written
assembler code.  For the byte stream fifo the generate code is exact the
same as with the current kfifo implementation.  For all other types of
fifos the code is smaller before, because the interface is easier to use.

The main goal was to provide an API which is very intuitive, save and easy
to use.  So linux will get now a powerful fifo API which provides all what
a developer needs.  This will save in the future a lot of kernel space,
since there is no need to write an own implementation.  Most of the device
driver developers need a fifo, and also deep kernel development will gain
benefit from this API.

Here are the results of the text section usage:

Example 1:
                        kfifo_put/_get  kfifo_in/out    current kfifo
dynamic allocated       0x000002a8      0x00000291      0x00000299
in place                0x00000291      0x0000026e      0x00000273

kfifo.c                 new             old
text section size       0x00000be5      0x000008b2

As you can see, kfifo_put/kfifo_get creates a little bit more code than
kfifo_in/kfifo_out, but it is much faster (the code is inline).

The code is complete hand crafted and optimized.  The text section size is
as small as possible.  You get all the fifo handling in only 3 kb.  This
includes type safe fix size records, dynamic records and DMA handling.

This should be the final version. All requested features are implemented.

Note: Most features of this API doesn't have any users.  All functions
which are not used in the next 9 months will be removed.  So, please adapt
your drivers and other sources as soon as possible to the new API and post
it.

This are the features which are currently not used in the kernel:

kfifo_to_user()
kfifo_from_user()
kfifo_dma_....() macros
kfifo_esize()
kfifo_recsize()
kfifo_put()
kfifo_get()

The fixed size record elements, exclude "unsigned char" fifo's and the
variable size records fifo's

This patch:

User of the kernel fifo should never bypass the API and directly access
the fifo structure.  Otherwise it will be very hard to maintain the API.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11 08:59:23 -07:00

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/*
* nozomi.c -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
*
* Written by: Ulf Jakobsson,
* Jan Åkerfeldt,
* Stefan Thomasson,
*
* Maintained by: Paul Hardwick (p.hardwick@option.com)
*
* Patches:
* Locking code changes for Vodafone by Sphere Systems Ltd,
* Andrew Bird (ajb@spheresystems.co.uk )
* & Phil Sanderson
*
* Source has been ported from an implementation made by Filip Aben @ Option
*
* --------------------------------------------------------------------------
*
* Copyright (c) 2005,2006 Option Wireless Sweden AB
* Copyright (c) 2006 Sphere Systems Ltd
* Copyright (c) 2006 Option Wireless n/v
* All rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* --------------------------------------------------------------------------
*/
/* Enable this to have a lot of debug printouts */
#define DEBUG
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/kfifo.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <linux/delay.h>
#define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
__DATE__ " " __TIME__ ")"
/* Macros definitions */
/* Default debug printout level */
#define NOZOMI_DEBUG_LEVEL 0x00
#define P_BUF_SIZE 128
#define NFO(_err_flag_, args...) \
do { \
char tmp[P_BUF_SIZE]; \
snprintf(tmp, sizeof(tmp), ##args); \
printk(_err_flag_ "[%d] %s(): %s\n", __LINE__, \
__func__, tmp); \
} while (0)
#define DBG1(args...) D_(0x01, ##args)
#define DBG2(args...) D_(0x02, ##args)
#define DBG3(args...) D_(0x04, ##args)
#define DBG4(args...) D_(0x08, ##args)
#define DBG5(args...) D_(0x10, ##args)
#define DBG6(args...) D_(0x20, ##args)
#define DBG7(args...) D_(0x40, ##args)
#define DBG8(args...) D_(0x80, ##args)
#ifdef DEBUG
/* Do we need this settable at runtime? */
static int debug = NOZOMI_DEBUG_LEVEL;
#define D(lvl, args...) do \
{if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
while (0)
#define D_(lvl, args...) D(lvl, ##args)
/* These printouts are always printed */
#else
static int debug;
#define D_(lvl, args...)
#endif
/* TODO: rewrite to optimize macros... */
#define TMP_BUF_MAX 256
#define DUMP(buf__,len__) \
do { \
char tbuf[TMP_BUF_MAX] = {0};\
if (len__ > 1) {\
snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
if (tbuf[len__-2] == '\r') {\
tbuf[len__-2] = 'r';\
} \
DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
} else {\
DBG1("SENDING: '%s' (%d)", tbuf, len__);\
} \
} while (0)
/* Defines */
#define NOZOMI_NAME "nozomi"
#define NOZOMI_NAME_TTY "nozomi_tty"
#define DRIVER_DESC "Nozomi driver"
#define NTTY_TTY_MAXMINORS 256
#define NTTY_FIFO_BUFFER_SIZE 8192
/* Must be power of 2 */
#define FIFO_BUFFER_SIZE_UL 8192
/* Size of tmp send buffer to card */
#define SEND_BUF_MAX 1024
#define RECEIVE_BUF_MAX 4
#define R_IIR 0x0000 /* Interrupt Identity Register */
#define R_FCR 0x0000 /* Flow Control Register */
#define R_IER 0x0004 /* Interrupt Enable Register */
#define CONFIG_MAGIC 0xEFEFFEFE
#define TOGGLE_VALID 0x0000
/* Definition of interrupt tokens */
#define MDM_DL1 0x0001
#define MDM_UL1 0x0002
#define MDM_DL2 0x0004
#define MDM_UL2 0x0008
#define DIAG_DL1 0x0010
#define DIAG_DL2 0x0020
#define DIAG_UL 0x0040
#define APP1_DL 0x0080
#define APP1_UL 0x0100
#define APP2_DL 0x0200
#define APP2_UL 0x0400
#define CTRL_DL 0x0800
#define CTRL_UL 0x1000
#define RESET 0x8000
#define MDM_DL (MDM_DL1 | MDM_DL2)
#define MDM_UL (MDM_UL1 | MDM_UL2)
#define DIAG_DL (DIAG_DL1 | DIAG_DL2)
/* modem signal definition */
#define CTRL_DSR 0x0001
#define CTRL_DCD 0x0002
#define CTRL_RI 0x0004
#define CTRL_CTS 0x0008
#define CTRL_DTR 0x0001
#define CTRL_RTS 0x0002
#define MAX_PORT 4
#define NOZOMI_MAX_PORTS 5
#define NOZOMI_MAX_CARDS (NTTY_TTY_MAXMINORS / MAX_PORT)
/* Type definitions */
/*
* There are two types of nozomi cards,
* one with 2048 memory and with 8192 memory
*/
enum card_type {
F32_2 = 2048, /* 512 bytes downlink + uplink * 2 -> 2048 */
F32_8 = 8192, /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
};
/* Initialization states a card can be in */
enum card_state {
NOZOMI_STATE_UKNOWN = 0,
NOZOMI_STATE_ENABLED = 1, /* pci device enabled */
NOZOMI_STATE_ALLOCATED = 2, /* config setup done */
NOZOMI_STATE_READY = 3, /* flowcontrols received */
};
/* Two different toggle channels exist */
enum channel_type {
CH_A = 0,
CH_B = 1,
};
/* Port definition for the card regarding flow control */
enum ctrl_port_type {
CTRL_CMD = 0,
CTRL_MDM = 1,
CTRL_DIAG = 2,
CTRL_APP1 = 3,
CTRL_APP2 = 4,
CTRL_ERROR = -1,
};
/* Ports that the nozomi has */
enum port_type {
PORT_MDM = 0,
PORT_DIAG = 1,
PORT_APP1 = 2,
PORT_APP2 = 3,
PORT_CTRL = 4,
PORT_ERROR = -1,
};
#ifdef __BIG_ENDIAN
/* Big endian */
struct toggles {
unsigned int enabled:5; /*
* Toggle fields are valid if enabled is 0,
* else A-channels must always be used.
*/
unsigned int diag_dl:1;
unsigned int mdm_dl:1;
unsigned int mdm_ul:1;
} __attribute__ ((packed));
/* Configuration table to read at startup of card */
/* Is for now only needed during initialization phase */
struct config_table {
u32 signature;
u16 product_information;
u16 version;
u8 pad3[3];
struct toggles toggle;
u8 pad1[4];
u16 dl_mdm_len1; /*
* If this is 64, it can hold
* 60 bytes + 4 that is length field
*/
u16 dl_start;
u16 dl_diag_len1;
u16 dl_mdm_len2; /*
* If this is 64, it can hold
* 60 bytes + 4 that is length field
*/
u16 dl_app1_len;
u16 dl_diag_len2;
u16 dl_ctrl_len;
u16 dl_app2_len;
u8 pad2[16];
u16 ul_mdm_len1;
u16 ul_start;
u16 ul_diag_len;
u16 ul_mdm_len2;
u16 ul_app1_len;
u16 ul_app2_len;
u16 ul_ctrl_len;
} __attribute__ ((packed));
/* This stores all control downlink flags */
struct ctrl_dl {
u8 port;
unsigned int reserved:4;
unsigned int CTS:1;
unsigned int RI:1;
unsigned int DCD:1;
unsigned int DSR:1;
} __attribute__ ((packed));
/* This stores all control uplink flags */
struct ctrl_ul {
u8 port;
unsigned int reserved:6;
unsigned int RTS:1;
unsigned int DTR:1;
} __attribute__ ((packed));
#else
/* Little endian */
/* This represents the toggle information */
struct toggles {
unsigned int mdm_ul:1;
unsigned int mdm_dl:1;
unsigned int diag_dl:1;
unsigned int enabled:5; /*
* Toggle fields are valid if enabled is 0,
* else A-channels must always be used.
*/
} __attribute__ ((packed));
/* Configuration table to read at startup of card */
struct config_table {
u32 signature;
u16 version;
u16 product_information;
struct toggles toggle;
u8 pad1[7];
u16 dl_start;
u16 dl_mdm_len1; /*
* If this is 64, it can hold
* 60 bytes + 4 that is length field
*/
u16 dl_mdm_len2;
u16 dl_diag_len1;
u16 dl_diag_len2;
u16 dl_app1_len;
u16 dl_app2_len;
u16 dl_ctrl_len;
u8 pad2[16];
u16 ul_start;
u16 ul_mdm_len2;
u16 ul_mdm_len1;
u16 ul_diag_len;
u16 ul_app1_len;
u16 ul_app2_len;
u16 ul_ctrl_len;
} __attribute__ ((packed));
/* This stores all control downlink flags */
struct ctrl_dl {
unsigned int DSR:1;
unsigned int DCD:1;
unsigned int RI:1;
unsigned int CTS:1;
unsigned int reserverd:4;
u8 port;
} __attribute__ ((packed));
/* This stores all control uplink flags */
struct ctrl_ul {
unsigned int DTR:1;
unsigned int RTS:1;
unsigned int reserved:6;
u8 port;
} __attribute__ ((packed));
#endif
/* This holds all information that is needed regarding a port */
struct port {
struct tty_port port;
u8 update_flow_control;
struct ctrl_ul ctrl_ul;
struct ctrl_dl ctrl_dl;
struct kfifo fifo_ul;
void __iomem *dl_addr[2];
u32 dl_size[2];
u8 toggle_dl;
void __iomem *ul_addr[2];
u32 ul_size[2];
u8 toggle_ul;
u16 token_dl;
/* mutex to ensure one access patch to this port */
struct mutex tty_sem;
wait_queue_head_t tty_wait;
struct async_icount tty_icount;
struct nozomi *dc;
};
/* Private data one for each card in the system */
struct nozomi {
void __iomem *base_addr;
unsigned long flip;
/* Pointers to registers */
void __iomem *reg_iir;
void __iomem *reg_fcr;
void __iomem *reg_ier;
u16 last_ier;
enum card_type card_type;
struct config_table config_table; /* Configuration table */
struct pci_dev *pdev;
struct port port[NOZOMI_MAX_PORTS];
u8 *send_buf;
spinlock_t spin_mutex; /* secures access to registers and tty */
unsigned int index_start;
enum card_state state;
u32 open_ttys;
};
/* This is a data packet that is read or written to/from card */
struct buffer {
u32 size; /* size is the length of the data buffer */
u8 *data;
} __attribute__ ((packed));
/* Global variables */
static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
{PCI_DEVICE(0x1931, 0x000c)}, /* Nozomi HSDPA */
{},
};
MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
static struct tty_driver *ntty_driver;
static const struct tty_port_operations noz_tty_port_ops;
/*
* find card by tty_index
*/
static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
{
return tty ? ndevs[tty->index / MAX_PORT] : NULL;
}
static inline struct port *get_port_by_tty(const struct tty_struct *tty)
{
struct nozomi *ndev = get_dc_by_tty(tty);
return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
}
/*
* TODO:
* -Optimize
* -Rewrite cleaner
*/
static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
u32 size_bytes)
{
u32 i = 0;
const u32 __iomem *ptr = mem_addr_start;
u16 *buf16;
if (unlikely(!ptr || !buf))
goto out;
/* shortcut for extremely often used cases */
switch (size_bytes) {
case 2: /* 2 bytes */
buf16 = (u16 *) buf;
*buf16 = __le16_to_cpu(readw(ptr));
goto out;
break;
case 4: /* 4 bytes */
*(buf) = __le32_to_cpu(readl(ptr));
goto out;
break;
}
while (i < size_bytes) {
if (size_bytes - i == 2) {
/* Handle 2 bytes in the end */
buf16 = (u16 *) buf;
*(buf16) = __le16_to_cpu(readw(ptr));
i += 2;
} else {
/* Read 4 bytes */
*(buf) = __le32_to_cpu(readl(ptr));
i += 4;
}
buf++;
ptr++;
}
out:
return;
}
/*
* TODO:
* -Optimize
* -Rewrite cleaner
*/
static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
u32 size_bytes)
{
u32 i = 0;
u32 __iomem *ptr = mem_addr_start;
const u16 *buf16;
if (unlikely(!ptr || !buf))
return 0;
/* shortcut for extremely often used cases */
switch (size_bytes) {
case 2: /* 2 bytes */
buf16 = (const u16 *)buf;
writew(__cpu_to_le16(*buf16), ptr);
return 2;
break;
case 1: /*
* also needs to write 4 bytes in this case
* so falling through..
*/
case 4: /* 4 bytes */
writel(__cpu_to_le32(*buf), ptr);
return 4;
break;
}
while (i < size_bytes) {
if (size_bytes - i == 2) {
/* 2 bytes */
buf16 = (const u16 *)buf;
writew(__cpu_to_le16(*buf16), ptr);
i += 2;
} else {
/* 4 bytes */
writel(__cpu_to_le32(*buf), ptr);
i += 4;
}
buf++;
ptr++;
}
return i;
}
/* Setup pointers to different channels and also setup buffer sizes. */
static void setup_memory(struct nozomi *dc)
{
void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
/* The length reported is including the length field of 4 bytes,
* hence subtract with 4.
*/
const u16 buff_offset = 4;
/* Modem port dl configuration */
dc->port[PORT_MDM].dl_addr[CH_A] = offset;
dc->port[PORT_MDM].dl_addr[CH_B] =
(offset += dc->config_table.dl_mdm_len1);
dc->port[PORT_MDM].dl_size[CH_A] =
dc->config_table.dl_mdm_len1 - buff_offset;
dc->port[PORT_MDM].dl_size[CH_B] =
dc->config_table.dl_mdm_len2 - buff_offset;
/* Diag port dl configuration */
dc->port[PORT_DIAG].dl_addr[CH_A] =
(offset += dc->config_table.dl_mdm_len2);
dc->port[PORT_DIAG].dl_size[CH_A] =
dc->config_table.dl_diag_len1 - buff_offset;
dc->port[PORT_DIAG].dl_addr[CH_B] =
(offset += dc->config_table.dl_diag_len1);
dc->port[PORT_DIAG].dl_size[CH_B] =
dc->config_table.dl_diag_len2 - buff_offset;
/* App1 port dl configuration */
dc->port[PORT_APP1].dl_addr[CH_A] =
(offset += dc->config_table.dl_diag_len2);
dc->port[PORT_APP1].dl_size[CH_A] =
dc->config_table.dl_app1_len - buff_offset;
/* App2 port dl configuration */
dc->port[PORT_APP2].dl_addr[CH_A] =
(offset += dc->config_table.dl_app1_len);
dc->port[PORT_APP2].dl_size[CH_A] =
dc->config_table.dl_app2_len - buff_offset;
/* Ctrl dl configuration */
dc->port[PORT_CTRL].dl_addr[CH_A] =
(offset += dc->config_table.dl_app2_len);
dc->port[PORT_CTRL].dl_size[CH_A] =
dc->config_table.dl_ctrl_len - buff_offset;
offset = dc->base_addr + dc->config_table.ul_start;
/* Modem Port ul configuration */
dc->port[PORT_MDM].ul_addr[CH_A] = offset;
dc->port[PORT_MDM].ul_size[CH_A] =
dc->config_table.ul_mdm_len1 - buff_offset;
dc->port[PORT_MDM].ul_addr[CH_B] =
(offset += dc->config_table.ul_mdm_len1);
dc->port[PORT_MDM].ul_size[CH_B] =
dc->config_table.ul_mdm_len2 - buff_offset;
/* Diag port ul configuration */
dc->port[PORT_DIAG].ul_addr[CH_A] =
(offset += dc->config_table.ul_mdm_len2);
dc->port[PORT_DIAG].ul_size[CH_A] =
dc->config_table.ul_diag_len - buff_offset;
/* App1 port ul configuration */
dc->port[PORT_APP1].ul_addr[CH_A] =
(offset += dc->config_table.ul_diag_len);
dc->port[PORT_APP1].ul_size[CH_A] =
dc->config_table.ul_app1_len - buff_offset;
/* App2 port ul configuration */
dc->port[PORT_APP2].ul_addr[CH_A] =
(offset += dc->config_table.ul_app1_len);
dc->port[PORT_APP2].ul_size[CH_A] =
dc->config_table.ul_app2_len - buff_offset;
/* Ctrl ul configuration */
dc->port[PORT_CTRL].ul_addr[CH_A] =
(offset += dc->config_table.ul_app2_len);
dc->port[PORT_CTRL].ul_size[CH_A] =
dc->config_table.ul_ctrl_len - buff_offset;
}
/* Dump config table under initalization phase */
#ifdef DEBUG
static void dump_table(const struct nozomi *dc)
{
DBG3("signature: 0x%08X", dc->config_table.signature);
DBG3("version: 0x%04X", dc->config_table.version);
DBG3("product_information: 0x%04X", \
dc->config_table.product_information);
DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
dc->config_table.dl_mdm_len1);
DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
dc->config_table.dl_mdm_len2);
DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
dc->config_table.dl_diag_len1);
DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
dc->config_table.dl_diag_len2);
DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
dc->config_table.dl_app1_len);
DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
dc->config_table.dl_app2_len);
DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
dc->config_table.dl_ctrl_len);
DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
dc->config_table.ul_start);
DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
dc->config_table.ul_mdm_len1);
DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
dc->config_table.ul_mdm_len2);
DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
dc->config_table.ul_diag_len);
DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
dc->config_table.ul_app1_len);
DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
dc->config_table.ul_app2_len);
DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
dc->config_table.ul_ctrl_len);
}
#else
static inline void dump_table(const struct nozomi *dc) { }
#endif
/*
* Read configuration table from card under intalization phase
* Returns 1 if ok, else 0
*/
static int nozomi_read_config_table(struct nozomi *dc)
{
read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
sizeof(struct config_table));
if (dc->config_table.signature != CONFIG_MAGIC) {
dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
dc->config_table.signature, CONFIG_MAGIC);
return 0;
}
if ((dc->config_table.version == 0)
|| (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
int i;
DBG1("Second phase, configuring card");
setup_memory(dc);
dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
dc->port[PORT_MDM].toggle_ul,
dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
dump_table(dc);
for (i = PORT_MDM; i < MAX_PORT; i++) {
memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
}
/* Enable control channel */
dc->last_ier = dc->last_ier | CTRL_DL;
writew(dc->last_ier, dc->reg_ier);
dc->state = NOZOMI_STATE_ALLOCATED;
dev_info(&dc->pdev->dev, "Initialization OK!\n");
return 1;
}
if ((dc->config_table.version > 0)
&& (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
u32 offset = 0;
DBG1("First phase: pushing upload buffers, clearing download");
dev_info(&dc->pdev->dev, "Version of card: %d\n",
dc->config_table.version);
/* Here we should disable all I/O over F32. */
setup_memory(dc);
/*
* We should send ALL channel pair tokens back along
* with reset token
*/
/* push upload modem buffers */
write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
(u32 *) &offset, 4);
write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
(u32 *) &offset, 4);
writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
DBG1("First phase done");
}
return 1;
}
/* Enable uplink interrupts */
static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
{
static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
if (port < NOZOMI_MAX_PORTS) {
dc->last_ier |= mask[port];
writew(dc->last_ier, dc->reg_ier);
} else {
dev_err(&dc->pdev->dev, "Called with wrong port?\n");
}
}
/* Disable uplink interrupts */
static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
{
static const u16 mask[] =
{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
if (port < NOZOMI_MAX_PORTS) {
dc->last_ier &= mask[port];
writew(dc->last_ier, dc->reg_ier);
} else {
dev_err(&dc->pdev->dev, "Called with wrong port?\n");
}
}
/* Enable downlink interrupts */
static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
{
static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
if (port < NOZOMI_MAX_PORTS) {
dc->last_ier |= mask[port];
writew(dc->last_ier, dc->reg_ier);
} else {
dev_err(&dc->pdev->dev, "Called with wrong port?\n");
}
}
/* Disable downlink interrupts */
static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
{
static const u16 mask[] =
{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
if (port < NOZOMI_MAX_PORTS) {
dc->last_ier &= mask[port];
writew(dc->last_ier, dc->reg_ier);
} else {
dev_err(&dc->pdev->dev, "Called with wrong port?\n");
}
}
/*
* Return 1 - send buffer to card and ack.
* Return 0 - don't ack, don't send buffer to card.
*/
static int send_data(enum port_type index, struct nozomi *dc)
{
u32 size = 0;
struct port *port = &dc->port[index];
const u8 toggle = port->toggle_ul;
void __iomem *addr = port->ul_addr[toggle];
const u32 ul_size = port->ul_size[toggle];
struct tty_struct *tty = tty_port_tty_get(&port->port);
/* Get data from tty and place in buf for now */
size = kfifo_out(&port->fifo_ul, dc->send_buf,
ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
if (size == 0) {
DBG4("No more data to send, disable link:");
tty_kref_put(tty);
return 0;
}
/* DUMP(buf, size); */
/* Write length + data */
write_mem32(addr, (u32 *) &size, 4);
write_mem32(addr + 4, (u32 *) dc->send_buf, size);
if (tty)
tty_wakeup(tty);
tty_kref_put(tty);
return 1;
}
/* If all data has been read, return 1, else 0 */
static int receive_data(enum port_type index, struct nozomi *dc)
{
u8 buf[RECEIVE_BUF_MAX] = { 0 };
int size;
u32 offset = 4;
struct port *port = &dc->port[index];
void __iomem *addr = port->dl_addr[port->toggle_dl];
struct tty_struct *tty = tty_port_tty_get(&port->port);
int i, ret;
if (unlikely(!tty)) {
DBG1("tty not open for port: %d?", index);
return 1;
}
read_mem32((u32 *) &size, addr, 4);
/* DBG1( "%d bytes port: %d", size, index); */
if (test_bit(TTY_THROTTLED, &tty->flags)) {
DBG1("No room in tty, don't read data, don't ack interrupt, "
"disable interrupt");
/* disable interrupt in downlink... */
disable_transmit_dl(index, dc);
ret = 0;
goto put;
}
if (unlikely(size == 0)) {
dev_err(&dc->pdev->dev, "size == 0?\n");
ret = 1;
goto put;
}
while (size > 0) {
read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
if (size == 1) {
tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
size = 0;
} else if (size < RECEIVE_BUF_MAX) {
size -= tty_insert_flip_string(tty, (char *) buf, size);
} else {
i = tty_insert_flip_string(tty, \
(char *) buf, RECEIVE_BUF_MAX);
size -= i;
offset += i;
}
}
set_bit(index, &dc->flip);
ret = 1;
put:
tty_kref_put(tty);
return ret;
}
/* Debug for interrupts */
#ifdef DEBUG
static char *interrupt2str(u16 interrupt)
{
static char buf[TMP_BUF_MAX];
char *p = buf;
interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"MDM_DL2 ") : NULL;
interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"MDM_UL1 ") : NULL;
interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"MDM_UL2 ") : NULL;
interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"DIAG_DL1 ") : NULL;
interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"DIAG_DL2 ") : NULL;
interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"DIAG_UL ") : NULL;
interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"APP1_DL ") : NULL;
interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"APP2_DL ") : NULL;
interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"APP1_UL ") : NULL;
interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"APP2_UL ") : NULL;
interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"CTRL_DL ") : NULL;
interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"CTRL_UL ") : NULL;
interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
"RESET ") : NULL;
return buf;
}
#endif
/*
* Receive flow control
* Return 1 - If ok, else 0
*/
static int receive_flow_control(struct nozomi *dc)
{
enum port_type port = PORT_MDM;
struct ctrl_dl ctrl_dl;
struct ctrl_dl old_ctrl;
u16 enable_ier = 0;
read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
switch (ctrl_dl.port) {
case CTRL_CMD:
DBG1("The Base Band sends this value as a response to a "
"request for IMSI detach sent over the control "
"channel uplink (see section 7.6.1).");
break;
case CTRL_MDM:
port = PORT_MDM;
enable_ier = MDM_DL;
break;
case CTRL_DIAG:
port = PORT_DIAG;
enable_ier = DIAG_DL;
break;
case CTRL_APP1:
port = PORT_APP1;
enable_ier = APP1_DL;
break;
case CTRL_APP2:
port = PORT_APP2;
enable_ier = APP2_DL;
if (dc->state == NOZOMI_STATE_ALLOCATED) {
/*
* After card initialization the flow control
* received for APP2 is always the last
*/
dc->state = NOZOMI_STATE_READY;
dev_info(&dc->pdev->dev, "Device READY!\n");
}
break;
default:
dev_err(&dc->pdev->dev,
"ERROR: flow control received for non-existing port\n");
return 0;
};
DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
*((u16 *)&ctrl_dl));
old_ctrl = dc->port[port].ctrl_dl;
dc->port[port].ctrl_dl = ctrl_dl;
if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
DBG1("Disable interrupt (0x%04X) on port: %d",
enable_ier, port);
disable_transmit_ul(port, dc);
} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
if (kfifo_len(&dc->port[port].fifo_ul)) {
DBG1("Enable interrupt (0x%04X) on port: %d",
enable_ier, port);
DBG1("Data in buffer [%d], enable transmit! ",
kfifo_len(&dc->port[port].fifo_ul));
enable_transmit_ul(port, dc);
} else {
DBG1("No data in buffer...");
}
}
if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
DBG1(" No change in mctrl");
return 1;
}
/* Update statistics */
if (old_ctrl.CTS != ctrl_dl.CTS)
dc->port[port].tty_icount.cts++;
if (old_ctrl.DSR != ctrl_dl.DSR)
dc->port[port].tty_icount.dsr++;
if (old_ctrl.RI != ctrl_dl.RI)
dc->port[port].tty_icount.rng++;
if (old_ctrl.DCD != ctrl_dl.DCD)
dc->port[port].tty_icount.dcd++;
wake_up_interruptible(&dc->port[port].tty_wait);
DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
port,
dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
return 1;
}
static enum ctrl_port_type port2ctrl(enum port_type port,
const struct nozomi *dc)
{
switch (port) {
case PORT_MDM:
return CTRL_MDM;
case PORT_DIAG:
return CTRL_DIAG;
case PORT_APP1:
return CTRL_APP1;
case PORT_APP2:
return CTRL_APP2;
default:
dev_err(&dc->pdev->dev,
"ERROR: send flow control " \
"received for non-existing port\n");
};
return CTRL_ERROR;
}
/*
* Send flow control, can only update one channel at a time
* Return 0 - If we have updated all flow control
* Return 1 - If we need to update more flow control, ack current enable more
*/
static int send_flow_control(struct nozomi *dc)
{
u32 i, more_flow_control_to_be_updated = 0;
u16 *ctrl;
for (i = PORT_MDM; i < MAX_PORT; i++) {
if (dc->port[i].update_flow_control) {
if (more_flow_control_to_be_updated) {
/* We have more flow control to be updated */
return 1;
}
dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
ctrl = (u16 *)&dc->port[i].ctrl_ul;
write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
(u32 *) ctrl, 2);
dc->port[i].update_flow_control = 0;
more_flow_control_to_be_updated = 1;
}
}
return 0;
}
/*
* Handle downlink data, ports that are handled are modem and diagnostics
* Return 1 - ok
* Return 0 - toggle fields are out of sync
*/
static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
u16 read_iir, u16 mask1, u16 mask2)
{
if (*toggle == 0 && read_iir & mask1) {
if (receive_data(port, dc)) {
writew(mask1, dc->reg_fcr);
*toggle = !(*toggle);
}
if (read_iir & mask2) {
if (receive_data(port, dc)) {
writew(mask2, dc->reg_fcr);
*toggle = !(*toggle);
}
}
} else if (*toggle == 1 && read_iir & mask2) {
if (receive_data(port, dc)) {
writew(mask2, dc->reg_fcr);
*toggle = !(*toggle);
}
if (read_iir & mask1) {
if (receive_data(port, dc)) {
writew(mask1, dc->reg_fcr);
*toggle = !(*toggle);
}
}
} else {
dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
*toggle);
return 0;
}
return 1;
}
/*
* Handle uplink data, this is currently for the modem port
* Return 1 - ok
* Return 0 - toggle field are out of sync
*/
static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
{
u8 *toggle = &(dc->port[port].toggle_ul);
if (*toggle == 0 && read_iir & MDM_UL1) {
dc->last_ier &= ~MDM_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(port, dc)) {
writew(MDM_UL1, dc->reg_fcr);
dc->last_ier = dc->last_ier | MDM_UL;
writew(dc->last_ier, dc->reg_ier);
*toggle = !*toggle;
}
if (read_iir & MDM_UL2) {
dc->last_ier &= ~MDM_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(port, dc)) {
writew(MDM_UL2, dc->reg_fcr);
dc->last_ier = dc->last_ier | MDM_UL;
writew(dc->last_ier, dc->reg_ier);
*toggle = !*toggle;
}
}
} else if (*toggle == 1 && read_iir & MDM_UL2) {
dc->last_ier &= ~MDM_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(port, dc)) {
writew(MDM_UL2, dc->reg_fcr);
dc->last_ier = dc->last_ier | MDM_UL;
writew(dc->last_ier, dc->reg_ier);
*toggle = !*toggle;
}
if (read_iir & MDM_UL1) {
dc->last_ier &= ~MDM_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(port, dc)) {
writew(MDM_UL1, dc->reg_fcr);
dc->last_ier = dc->last_ier | MDM_UL;
writew(dc->last_ier, dc->reg_ier);
*toggle = !*toggle;
}
}
} else {
writew(read_iir & MDM_UL, dc->reg_fcr);
dev_err(&dc->pdev->dev, "port out of sync!\n");
return 0;
}
return 1;
}
static irqreturn_t interrupt_handler(int irq, void *dev_id)
{
struct nozomi *dc = dev_id;
unsigned int a;
u16 read_iir;
if (!dc)
return IRQ_NONE;
spin_lock(&dc->spin_mutex);
read_iir = readw(dc->reg_iir);
/* Card removed */
if (read_iir == (u16)-1)
goto none;
/*
* Just handle interrupt enabled in IER
* (by masking with dc->last_ier)
*/
read_iir &= dc->last_ier;
if (read_iir == 0)
goto none;
DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
dc->last_ier);
if (read_iir & RESET) {
if (unlikely(!nozomi_read_config_table(dc))) {
dc->last_ier = 0x0;
writew(dc->last_ier, dc->reg_ier);
dev_err(&dc->pdev->dev, "Could not read status from "
"card, we should disable interface\n");
} else {
writew(RESET, dc->reg_fcr);
}
/* No more useful info if this was the reset interrupt. */
goto exit_handler;
}
if (read_iir & CTRL_UL) {
DBG1("CTRL_UL");
dc->last_ier &= ~CTRL_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_flow_control(dc)) {
writew(CTRL_UL, dc->reg_fcr);
dc->last_ier = dc->last_ier | CTRL_UL;
writew(dc->last_ier, dc->reg_ier);
}
}
if (read_iir & CTRL_DL) {
receive_flow_control(dc);
writew(CTRL_DL, dc->reg_fcr);
}
if (read_iir & MDM_DL) {
if (!handle_data_dl(dc, PORT_MDM,
&(dc->port[PORT_MDM].toggle_dl), read_iir,
MDM_DL1, MDM_DL2)) {
dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
goto exit_handler;
}
}
if (read_iir & MDM_UL) {
if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
goto exit_handler;
}
}
if (read_iir & DIAG_DL) {
if (!handle_data_dl(dc, PORT_DIAG,
&(dc->port[PORT_DIAG].toggle_dl), read_iir,
DIAG_DL1, DIAG_DL2)) {
dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
goto exit_handler;
}
}
if (read_iir & DIAG_UL) {
dc->last_ier &= ~DIAG_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(PORT_DIAG, dc)) {
writew(DIAG_UL, dc->reg_fcr);
dc->last_ier = dc->last_ier | DIAG_UL;
writew(dc->last_ier, dc->reg_ier);
}
}
if (read_iir & APP1_DL) {
if (receive_data(PORT_APP1, dc))
writew(APP1_DL, dc->reg_fcr);
}
if (read_iir & APP1_UL) {
dc->last_ier &= ~APP1_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(PORT_APP1, dc)) {
writew(APP1_UL, dc->reg_fcr);
dc->last_ier = dc->last_ier | APP1_UL;
writew(dc->last_ier, dc->reg_ier);
}
}
if (read_iir & APP2_DL) {
if (receive_data(PORT_APP2, dc))
writew(APP2_DL, dc->reg_fcr);
}
if (read_iir & APP2_UL) {
dc->last_ier &= ~APP2_UL;
writew(dc->last_ier, dc->reg_ier);
if (send_data(PORT_APP2, dc)) {
writew(APP2_UL, dc->reg_fcr);
dc->last_ier = dc->last_ier | APP2_UL;
writew(dc->last_ier, dc->reg_ier);
}
}
exit_handler:
spin_unlock(&dc->spin_mutex);
for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
struct tty_struct *tty;
if (test_and_clear_bit(a, &dc->flip)) {
tty = tty_port_tty_get(&dc->port[a].port);
if (tty)
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
}
return IRQ_HANDLED;
none:
spin_unlock(&dc->spin_mutex);
return IRQ_NONE;
}
static void nozomi_get_card_type(struct nozomi *dc)
{
int i;
u32 size = 0;
for (i = 0; i < 6; i++)
size += pci_resource_len(dc->pdev, i);
/* Assume card type F32_8 if no match */
dc->card_type = size == 2048 ? F32_2 : F32_8;
dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
}
static void nozomi_setup_private_data(struct nozomi *dc)
{
void __iomem *offset = dc->base_addr + dc->card_type / 2;
unsigned int i;
dc->reg_fcr = (void __iomem *)(offset + R_FCR);
dc->reg_iir = (void __iomem *)(offset + R_IIR);
dc->reg_ier = (void __iomem *)(offset + R_IER);
dc->last_ier = 0;
dc->flip = 0;
dc->port[PORT_MDM].token_dl = MDM_DL;
dc->port[PORT_DIAG].token_dl = DIAG_DL;
dc->port[PORT_APP1].token_dl = APP1_DL;
dc->port[PORT_APP2].token_dl = APP2_DL;
for (i = 0; i < MAX_PORT; i++)
init_waitqueue_head(&dc->port[i].tty_wait);
}
static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
return sprintf(buf, "%d\n", dc->card_type);
}
static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
return sprintf(buf, "%u\n", dc->open_ttys);
}
static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
static void make_sysfs_files(struct nozomi *dc)
{
if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
dev_err(&dc->pdev->dev,
"Could not create sysfs file for card_type\n");
if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
dev_err(&dc->pdev->dev,
"Could not create sysfs file for open_ttys\n");
}
static void remove_sysfs_files(struct nozomi *dc)
{
device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
}
/* Allocate memory for one device */
static int __devinit nozomi_card_init(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
resource_size_t start;
int ret;
struct nozomi *dc = NULL;
int ndev_idx;
int i;
dev_dbg(&pdev->dev, "Init, new card found\n");
for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
if (!ndevs[ndev_idx])
break;
if (ndev_idx >= ARRAY_SIZE(ndevs)) {
dev_err(&pdev->dev, "no free tty range for this card left\n");
ret = -EIO;
goto err;
}
dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
if (unlikely(!dc)) {
dev_err(&pdev->dev, "Could not allocate memory\n");
ret = -ENOMEM;
goto err_free;
}
dc->pdev = pdev;
ret = pci_enable_device(dc->pdev);
if (ret) {
dev_err(&pdev->dev, "Failed to enable PCI Device\n");
goto err_free;
}
ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
if (ret) {
dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
(int) /* nozomi_private.io_addr */ 0);
goto err_disable_device;
}
start = pci_resource_start(dc->pdev, 0);
if (start == 0) {
dev_err(&pdev->dev, "No I/O address for card detected\n");
ret = -ENODEV;
goto err_rel_regs;
}
/* Find out what card type it is */
nozomi_get_card_type(dc);
dc->base_addr = ioremap_nocache(start, dc->card_type);
if (!dc->base_addr) {
dev_err(&pdev->dev, "Unable to map card MMIO\n");
ret = -ENODEV;
goto err_rel_regs;
}
dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
if (!dc->send_buf) {
dev_err(&pdev->dev, "Could not allocate send buffer?\n");
ret = -ENOMEM;
goto err_free_sbuf;
}
for (i = PORT_MDM; i < MAX_PORT; i++) {
if (kfifo_alloc(&dc->port[i].fifo_ul,
FIFO_BUFFER_SIZE_UL, GFP_ATOMIC)) {
dev_err(&pdev->dev,
"Could not allocate kfifo buffer\n");
ret = -ENOMEM;
goto err_free_kfifo;
}
}
spin_lock_init(&dc->spin_mutex);
nozomi_setup_private_data(dc);
/* Disable all interrupts */
dc->last_ier = 0;
writew(dc->last_ier, dc->reg_ier);
ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
NOZOMI_NAME, dc);
if (unlikely(ret)) {
dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
goto err_free_kfifo;
}
DBG1("base_addr: %p", dc->base_addr);
make_sysfs_files(dc);
dc->index_start = ndev_idx * MAX_PORT;
ndevs[ndev_idx] = dc;
pci_set_drvdata(pdev, dc);
/* Enable RESET interrupt */
dc->last_ier = RESET;
iowrite16(dc->last_ier, dc->reg_ier);
dc->state = NOZOMI_STATE_ENABLED;
for (i = 0; i < MAX_PORT; i++) {
struct device *tty_dev;
struct port *port = &dc->port[i];
port->dc = dc;
mutex_init(&port->tty_sem);
tty_port_init(&port->port);
port->port.ops = &noz_tty_port_ops;
tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
&pdev->dev);
if (IS_ERR(tty_dev)) {
ret = PTR_ERR(tty_dev);
dev_err(&pdev->dev, "Could not allocate tty?\n");
goto err_free_tty;
}
}
return 0;
err_free_tty:
for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
tty_unregister_device(ntty_driver, i);
err_free_kfifo:
for (i = 0; i < MAX_PORT; i++)
kfifo_free(&dc->port[i].fifo_ul);
err_free_sbuf:
kfree(dc->send_buf);
iounmap(dc->base_addr);
err_rel_regs:
pci_release_regions(pdev);
err_disable_device:
pci_disable_device(pdev);
err_free:
kfree(dc);
err:
return ret;
}
static void __devexit tty_exit(struct nozomi *dc)
{
unsigned int i;
DBG1(" ");
flush_scheduled_work();
for (i = 0; i < MAX_PORT; ++i) {
struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
if (tty && list_empty(&tty->hangup_work.entry))
tty_hangup(tty);
tty_kref_put(tty);
}
/* Racy below - surely should wait for scheduled work to be done or
complete off a hangup method ? */
while (dc->open_ttys)
msleep(1);
for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
tty_unregister_device(ntty_driver, i);
}
/* Deallocate memory for one device */
static void __devexit nozomi_card_exit(struct pci_dev *pdev)
{
int i;
struct ctrl_ul ctrl;
struct nozomi *dc = pci_get_drvdata(pdev);
/* Disable all interrupts */
dc->last_ier = 0;
writew(dc->last_ier, dc->reg_ier);
tty_exit(dc);
/* Send 0x0001, command card to resend the reset token. */
/* This is to get the reset when the module is reloaded. */
ctrl.port = 0x00;
ctrl.reserved = 0;
ctrl.RTS = 0;
ctrl.DTR = 1;
DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
/* Setup dc->reg addresses to we can use defines here */
write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
writew(CTRL_UL, dc->reg_fcr); /* push the token to the card. */
remove_sysfs_files(dc);
free_irq(pdev->irq, dc);
for (i = 0; i < MAX_PORT; i++)
kfifo_free(&dc->port[i].fifo_ul);
kfree(dc->send_buf);
iounmap(dc->base_addr);
pci_release_regions(pdev);
pci_disable_device(pdev);
ndevs[dc->index_start / MAX_PORT] = NULL;
kfree(dc);
}
static void set_rts(const struct tty_struct *tty, int rts)
{
struct port *port = get_port_by_tty(tty);
port->ctrl_ul.RTS = rts;
port->update_flow_control = 1;
enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
}
static void set_dtr(const struct tty_struct *tty, int dtr)
{
struct port *port = get_port_by_tty(tty);
DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
port->ctrl_ul.DTR = dtr;
port->update_flow_control = 1;
enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
}
/*
* ----------------------------------------------------------------------------
* TTY code
* ----------------------------------------------------------------------------
*/
static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
{
struct port *port = get_port_by_tty(tty);
struct nozomi *dc = get_dc_by_tty(tty);
int ret;
if (!port || !dc || dc->state != NOZOMI_STATE_READY)
return -ENODEV;
ret = tty_init_termios(tty);
if (ret == 0) {
tty_driver_kref_get(driver);
tty->count++;
tty->driver_data = port;
driver->ttys[tty->index] = tty;
}
return ret;
}
static void ntty_cleanup(struct tty_struct *tty)
{
tty->driver_data = NULL;
}
static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
{
struct port *port = container_of(tport, struct port, port);
struct nozomi *dc = port->dc;
unsigned long flags;
DBG1("open: %d", port->token_dl);
spin_lock_irqsave(&dc->spin_mutex, flags);
dc->last_ier = dc->last_ier | port->token_dl;
writew(dc->last_ier, dc->reg_ier);
dc->open_ttys++;
spin_unlock_irqrestore(&dc->spin_mutex, flags);
printk("noz: activated %d: %p\n", tty->index, tport);
return 0;
}
static int ntty_open(struct tty_struct *tty, struct file *filp)
{
struct port *port = tty->driver_data;
return tty_port_open(&port->port, tty, filp);
}
static void ntty_shutdown(struct tty_port *tport)
{
struct port *port = container_of(tport, struct port, port);
struct nozomi *dc = port->dc;
unsigned long flags;
DBG1("close: %d", port->token_dl);
spin_lock_irqsave(&dc->spin_mutex, flags);
dc->last_ier &= ~(port->token_dl);
writew(dc->last_ier, dc->reg_ier);
dc->open_ttys--;
spin_unlock_irqrestore(&dc->spin_mutex, flags);
printk("noz: shutdown %p\n", tport);
}
static void ntty_close(struct tty_struct *tty, struct file *filp)
{
struct port *port = tty->driver_data;
if (port)
tty_port_close(&port->port, tty, filp);
}
static void ntty_hangup(struct tty_struct *tty)
{
struct port *port = tty->driver_data;
tty_port_hangup(&port->port);
}
/*
* called when the userspace process writes to the tty (/dev/noz*).
* Data is inserted into a fifo, which is then read and transfered to the modem.
*/
static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
int count)
{
int rval = -EINVAL;
struct nozomi *dc = get_dc_by_tty(tty);
struct port *port = tty->driver_data;
unsigned long flags;
/* DBG1( "WRITEx: %d, index = %d", count, index); */
if (!dc || !port)
return -ENODEV;
mutex_lock(&port->tty_sem);
if (unlikely(!port->port.count)) {
DBG1(" ");
goto exit;
}
rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
/* notify card */
if (unlikely(dc == NULL)) {
DBG1("No device context?");
goto exit;
}
spin_lock_irqsave(&dc->spin_mutex, flags);
/* CTS is only valid on the modem channel */
if (port == &(dc->port[PORT_MDM])) {
if (port->ctrl_dl.CTS) {
DBG4("Enable interrupt");
enable_transmit_ul(tty->index % MAX_PORT, dc);
} else {
dev_err(&dc->pdev->dev,
"CTS not active on modem port?\n");
}
} else {
enable_transmit_ul(tty->index % MAX_PORT, dc);
}
spin_unlock_irqrestore(&dc->spin_mutex, flags);
exit:
mutex_unlock(&port->tty_sem);
return rval;
}
/*
* Calculate how much is left in device
* This method is called by the upper tty layer.
* #according to sources N_TTY.c it expects a value >= 0 and
* does not check for negative values.
*
* If the port is unplugged report lots of room and let the bits
* dribble away so we don't block anything.
*/
static int ntty_write_room(struct tty_struct *tty)
{
struct port *port = tty->driver_data;
int room = 4096;
const struct nozomi *dc = get_dc_by_tty(tty);
if (dc) {
mutex_lock(&port->tty_sem);
if (port->port.count)
room = kfifo_avail(&port->fifo_ul);
mutex_unlock(&port->tty_sem);
}
return room;
}
/* Gets io control parameters */
static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
{
const struct port *port = tty->driver_data;
const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
/* Note: these could change under us but it is not clear this
matters if so */
return (ctrl_ul->RTS ? TIOCM_RTS : 0) |
(ctrl_ul->DTR ? TIOCM_DTR : 0) |
(ctrl_dl->DCD ? TIOCM_CAR : 0) |
(ctrl_dl->RI ? TIOCM_RNG : 0) |
(ctrl_dl->DSR ? TIOCM_DSR : 0) |
(ctrl_dl->CTS ? TIOCM_CTS : 0);
}
/* Sets io controls parameters */
static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct nozomi *dc = get_dc_by_tty(tty);
unsigned long flags;
spin_lock_irqsave(&dc->spin_mutex, flags);
if (set & TIOCM_RTS)
set_rts(tty, 1);
else if (clear & TIOCM_RTS)
set_rts(tty, 0);
if (set & TIOCM_DTR)
set_dtr(tty, 1);
else if (clear & TIOCM_DTR)
set_dtr(tty, 0);
spin_unlock_irqrestore(&dc->spin_mutex, flags);
return 0;
}
static int ntty_cflags_changed(struct port *port, unsigned long flags,
struct async_icount *cprev)
{
const struct async_icount cnow = port->tty_icount;
int ret;
ret = ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
((flags & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
*cprev = cnow;
return ret;
}
static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
{
const struct async_icount cnow = port->tty_icount;
struct serial_icounter_struct icount;
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
}
static int ntty_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct port *port = tty->driver_data;
void __user *argp = (void __user *)arg;
int rval = -ENOIOCTLCMD;
DBG1("******** IOCTL, cmd: %d", cmd);
switch (cmd) {
case TIOCMIWAIT: {
struct async_icount cprev = port->tty_icount;
rval = wait_event_interruptible(port->tty_wait,
ntty_cflags_changed(port, arg, &cprev));
break;
} case TIOCGICOUNT:
rval = ntty_ioctl_tiocgicount(port, argp);
break;
default:
DBG1("ERR: 0x%08X, %d", cmd, cmd);
break;
};
return rval;
}
/*
* Called by the upper tty layer when tty buffers are ready
* to receive data again after a call to throttle.
*/
static void ntty_unthrottle(struct tty_struct *tty)
{
struct nozomi *dc = get_dc_by_tty(tty);
unsigned long flags;
DBG1("UNTHROTTLE");
spin_lock_irqsave(&dc->spin_mutex, flags);
enable_transmit_dl(tty->index % MAX_PORT, dc);
set_rts(tty, 1);
spin_unlock_irqrestore(&dc->spin_mutex, flags);
}
/*
* Called by the upper tty layer when the tty buffers are almost full.
* The driver should stop send more data.
*/
static void ntty_throttle(struct tty_struct *tty)
{
struct nozomi *dc = get_dc_by_tty(tty);
unsigned long flags;
DBG1("THROTTLE");
spin_lock_irqsave(&dc->spin_mutex, flags);
set_rts(tty, 0);
spin_unlock_irqrestore(&dc->spin_mutex, flags);
}
/* Returns number of chars in buffer, called by tty layer */
static s32 ntty_chars_in_buffer(struct tty_struct *tty)
{
struct port *port = tty->driver_data;
struct nozomi *dc = get_dc_by_tty(tty);
s32 rval = 0;
if (unlikely(!dc || !port)) {
goto exit_in_buffer;
}
if (unlikely(!port->port.count)) {
dev_err(&dc->pdev->dev, "No tty open?\n");
goto exit_in_buffer;
}
rval = kfifo_len(&port->fifo_ul);
exit_in_buffer:
return rval;
}
static const struct tty_port_operations noz_tty_port_ops = {
.activate = ntty_activate,
.shutdown = ntty_shutdown,
};
static const struct tty_operations tty_ops = {
.ioctl = ntty_ioctl,
.open = ntty_open,
.close = ntty_close,
.hangup = ntty_hangup,
.write = ntty_write,
.write_room = ntty_write_room,
.unthrottle = ntty_unthrottle,
.throttle = ntty_throttle,
.chars_in_buffer = ntty_chars_in_buffer,
.tiocmget = ntty_tiocmget,
.tiocmset = ntty_tiocmset,
.install = ntty_install,
.cleanup = ntty_cleanup,
};
/* Module initialization */
static struct pci_driver nozomi_driver = {
.name = NOZOMI_NAME,
.id_table = nozomi_pci_tbl,
.probe = nozomi_card_init,
.remove = __devexit_p(nozomi_card_exit),
};
static __init int nozomi_init(void)
{
int ret;
printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
if (!ntty_driver)
return -ENOMEM;
ntty_driver->owner = THIS_MODULE;
ntty_driver->driver_name = NOZOMI_NAME_TTY;
ntty_driver->name = "noz";
ntty_driver->major = 0;
ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
ntty_driver->subtype = SERIAL_TYPE_NORMAL;
ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
ntty_driver->init_termios = tty_std_termios;
ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
HUPCL | CLOCAL;
ntty_driver->init_termios.c_ispeed = 115200;
ntty_driver->init_termios.c_ospeed = 115200;
tty_set_operations(ntty_driver, &tty_ops);
ret = tty_register_driver(ntty_driver);
if (ret) {
printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
goto free_tty;
}
ret = pci_register_driver(&nozomi_driver);
if (ret) {
printk(KERN_ERR "Nozomi: can't register pci driver\n");
goto unr_tty;
}
return 0;
unr_tty:
tty_unregister_driver(ntty_driver);
free_tty:
put_tty_driver(ntty_driver);
return ret;
}
static __exit void nozomi_exit(void)
{
printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
pci_unregister_driver(&nozomi_driver);
tty_unregister_driver(ntty_driver);
put_tty_driver(ntty_driver);
}
module_init(nozomi_init);
module_exit(nozomi_exit);
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION(DRIVER_DESC);
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